porphyrins

Pigments derived from porphin: all are chelates with metals (Fe, Mg, Co, Zn, Cu, Ni). Constituents of haemoglobin, chlorophyll, cytochromes.
Found on http://www.encyclo.co.uk/visitor-contributions.php

porphyrins

A group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached. The nature of the side chain is indicated by a prefix, as uroporphyrin, haematoporphyrin, etc. The porphyrins, in combination with iron, form the haem component in biologica...
Found on http://www.encyclo.co.uk/local/20973

porphyrins

A naturally occurring isomer of protoporphyrin demonstrating the typical porphyrin ring structure Water-soluble, nitrogen-containing organic compounds of great biological importance which are found in a variety of pigments, including hemoglobin, chlorophyll a and b, the cytochromes (concerned wi...
Found on http://www.daviddarling.info/encyclopedia/P/porphyrin.html

porphyrins

Type: Term Pronunciation: pōr′fi-rinz Definitions: 1. Pigments widely distributed throughout nature (heme, bile pigments, cytochromes) consisting of four pyrroles joined in a ring (porphin) structure. They are substitution products of porphin (porphyrin) and comprise several varieties, differing for the most part in the side chains (meth...
Found on http://www.medilexicon.com/medicaldictionary.php?t=71256
No exact match found